Children run in a 300m long-distance race at the International Children Mini-Marathon in Tallinn, capital of Estonia, on Sept. 13, 2014. About 5,000 Estonian and international children at the age of 2-12 years of age attended the event. (Xinhua/Viktor Vesterinen)

Children run in a 300m long-distance race at the International Children Mini-Marathon in Tallinn, capital of Estonia, on Sept. 13, 2014. About 5,000 Estonian and international children at the age of 2-12 years of age attended the event. (Xinhua/Viktor Vesterinen)

Children run in a 300m long-distance race at the International Children Mini-Marathon in Tallinn, capital of Estonia, on Sept. 13, 2014. About 5,000 Estonian and international children at the age of 2-12 years of age attended the event. (Xinhua/Viktor Vesterinen)